Michael redlinger



(No Model.)

M. RBDLINGBR. SPRING HINGE.

No. 443,057. Patented Deo. 16, 18901 a UNITED STATES PATENT OFFICE.; y

MICHAEL REDLINGER, oE EREEPoRr, ILLiNois, AssicNoR ro CHARLES MORGAN,ALBERT RAUMGARTEN, AND EDGAR n. MORGAN, ALL or SAME PLACE.

SPRING-HINGE.

SPECIFICATION forming part of Letters Patent No. 443,057, dated December16, 1890.

Application filed August 14, 1890. Serial No. 361,976. (No model.)

.To @ZZ whom t may concern:

Be it known that I, MICHAEL REDLINGER, a resident of Freeport, in thecounty of Stephenson and State of Illinois, have invented certain newand useful Improvements in Spring-Hinges; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use the same. l

My invention is in spring-hin ges that when the door is opened beyond acertain point reverse and then tend to throw the door stillV fartheropen.

In the accompanying drawings, Figure l is a plan of the hinge. Y Fig. 2is a plan of the opposite or inner side of the same. Fig. 3 is a sectionon the line 3 3, Fig. l.

The body of the hinge consists of two leaves A A', connected at each endby ears B B', provided with short pintles C C at some distance from thatface of the hinge that in use rests against the door and casing. Betweenthe pairs of ears lies a spring D, coiled about an arbor E, lying in aplane transverse to the pintle-line. The arbor is mounted in a frame F,rigidly connected with the leaf A, and preferably so formed as to coverthe outer side of the coil. Through this arbor alone thepower of thespring is exerted upon the leaf A. The arbor-bearings may be completecircles in cross-section, or may be open uponv the inner side to permitcasting Without The ends G G of the coil project oppositely uponopposite sides of the spring, and are bent into hooks Il Il', whichengage, respectively, rods or loops I I', both upon the leaf A and uponthat side of the pintle opposite to the leaf A. The spring is so formedthat tension must be put upon it in order to put it in engagement withboth rods or loops. When thus in engagement, its whole force actsthrough one hook upon the leaf A and by reaction an equal force isexerted through the opposite hook, and tends, like the direct force, topress the leaf toward the plane ofthe door, thus far supposed to beclosed. The effect upon the opposite leaf is precisely the same as ifequal forces dren1 the hooks in the opposite direction-that is, they actthrough a lever-arm equal to the distance of the hooks from the pintleand tend to close the doorfor no matter at what point the force istransmitted to the leaf A, it is in effect applied at the hooks, whichare at one side of the pintles, and the latter act as a fulcrum,resisting bodilymotion of the leaf A.

In practice it is immaterial which leaf is secured to the door; but forconvenience in description, let it be supposed to be the leaf A. Nowwhen the door is opened one hundred and eighty degrees the rods or loopsI I are carried bodily about the pintle-line to its opposite side, andduring the whole time are drawn toward the plane of the closed door bythe action of the spring. In so moving, their distance from thepintle-line first increases and then decreases, and the strain exertedthrough the hooks at first acts upon one side of the pintle-line andtends to close the door, but later acts upon the opposite side and thentends to open it. Evidently there is a point Where the strain acts uponneither side, but passes directly through the pintle-line, giving a deador reversing point Where there is no tendency to swingtihe door ineither direction. The location of this point depends upon the place ofthe rods or loops upon theirleaf, and they are usually so placed thatthe point may be reached when the door has opened about one hundred andtwenty degrees.

The spring is shown as midway between the ends of the hinge,perpendicular to the pintle-line, and projecting equally to the rightand left of that line, and also as parallel to the place of the closeddoor; but it is not essential that these constructions be exactlyfollowed.

l. The combination, with suitably connected hinge-leaves, of aspring-coil secured upon one of said leaves, Wit-h its axis transverseto the pintle and having both its ends in engagement with the oppositeleaf at one side of the pintle-line.

2. The combination, with twosutably-oon- In testimony whereof I havesigned this nectedhinge1eaves,ofaspring-albormounted specification inthe presence of two subscribupon one of said leaves in a line transverseto ing Witnesses. the pntle-line, and a spring-coil Wound about MICHAELREDLINGER. said arbor and having both its ends in en- Witnesses:gagement with suitable rods olloops upon the PHIL. SCHRENKLER, oppositeleaf at one side of the pntle-line. ALBERT HERBIG.

